Patients in all groups who have had breast-conservation surgery are also treated with radiotherapy. Radiotherapy should begin within 4 weeks of registration for patients receiving hormonal therapy alone or within 8 weeks after completion of chemotherapy. Patients participating in National Surgical Adjuvant Breast and Bowel Project (NSABP) and/or Radiation Therapy Oncology Group (RTOG) partial irradiation trial(s) may receive partial breast radiation.